/ Dictionary / Index R Rainbow Bridge: Meaning and Definition of Find definitions for: Rain'bow Bridge' Pronunciation: [key] a natural stone bridge in S Utah: a national monument. 290 ft. (88 m) high; 275 ft. (84 m) span. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rainbow rainbow cactus Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language